TextBlob: Use deferred bounds if negative letter or word spacing exists.

TextBlob: Use deferred bounds if negative letter or word spacing exists.

This is one case where we can wind up using layout bounds that aren't
appropriate for a visual bounding box. It happens to have the
particularly wrong effect of causing the text blob to be culled
altogether.

BUG=437121
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=186648

[jbroman, 2014-12-06 23:34:08]

jbroman@chromium.org changed reviewers:
+ eae@chromium.org, fmalita@chromium.org

[jbroman, 2014-12-06 23:34:09]

This seems like the most straightforward way to deal with this issue right now.

I also have a patch for HarfBuzzShaper to compute more reasonable visual bounds,
but I think that's separable from this.

I don't really like the idea of saying "oh, but those bounds are actually wrong"
after the fact, though, as long-term solution.

[f(malita), 2014-12-07 03:29:45]

lgtm

[jbroman, 2014-12-07 19:52:18]

The CQ bit was checked by jbroman@chromium.org

[commit-bot: I haz the power, 2014-12-07 19:53:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/778233002/1

[commit-bot: I haz the power, 2014-12-07 19:55:13]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=186648